UNIT 14 : DAWN OF MODERN PHYSICS
Dawn of Modern Physics is a core chapter in MDCAT Physics, sitting within the 20% Physics allocation of your 36-question paper.
What this chapter covers:
- Relative motion, frames of reference, and inertial versus non-inertial frames
- Postulates of the special theory of relativity, time dilation, length contraction, mass variation, and the energy-mass relation
- Black body radiation, Wien’s displacement law, Stefan-Boltzmann law, and the failure of classical theory (ultraviolet catastrophe)
- Planck’s hypothesis and the particle model of light in terms of photons with energy
- The photoelectric effect, Einstein’s photoelectric equation, and work function
- Compton effect and the Compton shift
- Pair production and annihilation of matter
- de Broglie’s hypothesis of the wave nature of particles and the Davisson-Germer experiment
- The electron microscope
- The uncertainty principle
This chapter blends conceptual depth with genuine calculation demands, moving from qualitative ideas like relativity’s postulates and wave-particle duality to formula-based problems on time dilation, photon energy, stopping potential, and Compton shift. Given this spread, expect it to sit mostly in the moderate range described by PMDC’s difficulty split, with a meaningful slice of harder numerical items testing whether you can apply the right formula under exam pressure.
Why this practice set helps:
- Covers every subtopic the PMDC curriculum identifies, plus the supporting concepts textbooks present alongside them
- Every question includes a full explanation of why the correct answer is right and why each other option is wrong
- Built to help you learn faster than passive reading, with nothing the exam may draw from left untouched
Work through this set attentively, and you build both the conceptual clarity these ideas demand and the calculation precision this chapter’s many formulas require.ecise, detail-level recall this chapter demands, from matching monomers to their polymers to distinguishing one adhesive or dye type from another.